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Analysis of Calcite Twins as Indicators of Paleostress History  

Park, Young-Seog (Department of Resource Engineering, Chosun University)
Jang, Bo-An (Department of Geophysics, Kangwon National University)
Kim, Cheong-Bin (Department of Science Education, Sunchon National University)
Kang, Seong-Seung (Research Institute of Basic Sciences, Sunchon National University)
Publication Information
Economic and Environmental Geology / v.40, no.4, 2007 , pp. 461-471 More about this Journal
Abstract
A temperature of deformation and the state and direction of paleostress at that time when twins in calcite grains had been produced were observed, using analysis of calcite twins as indicators of paleostress history. The study was performed with the target of carbonate rocks distributed randomly small size in the southern area of south Korea. Considering the appearance of twins (thin or thick straight twins with one or two twin sets), average twin strain (1.235-7.453%), thickness ($0.77-1.94{\mu}m$) and intensity (25.26-41.99 twins/mm) from the results of calculated calcite twins, it is estimated that calcite twins were produced under temperatures lower than approximately $150-200^{\circ}C$. In the magnitudes and directions of principal strains, the maximum shortening strain axis ($e_3\leftrightarrow{\sigma}_1$) is approximately N-S direction in the GS-1 area in the southern Gyeongsang Basin as well as in the BS-1 area in the southern Yongnam Massif, whereas E-W direction in the NR-1 area in the southwestern Ogcheon Fold Belt. In case of the maximum extension strain axis ($e_1\leftrightarrow{\sigma}_3$), it is oriented in NW-SE and NE-SW directions in the GS-1 and BS-1 area, respectively, and in N-S direction in the NR-1 area. That is, it is suggested that the paleostress which produced the calcite twins may be applied at least more than two times in the study area.
Keywords
Paleostress; Calcite twin; Deformation temperature; Principal strain; Maximum shortening;
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